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d in (-oo:+oo)
2*d+1 = 41-3*d // - 41-3*d
2*d-(-3*d)-41+1 = 0
2*d+3*d-41+1 = 0
5*d-40 = 0 // + 40
5*d = 40 // : 5
d = 40/5
d = 8
d = 8
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